Display panel, backlight module and display device

ABSTRACT

A display panel, a backlight module and a display device are provided in embodiments of the disclosure, the display panel comprising: a first substrate and a second substrate provided opposite to the first substrate, and a plurality of pixels arranged in an array between the first substrate and the second substrate, each pixel comprising at least three sub-pixels of different colors; and a region of the display panel corresponding to at least one of the sub-pixels of different colors is further provided with a respective photonic crystal layer, which is configured to filter a light ray in a predetermined waveband and to obtain a color of an emergent light from the region of the display panel corresponding to the at least one of the sub-pixels similar to an object color thereat.

CROSS-REFERENCE TO RELATED DISCLOSURE

The present disclosure claims the benefit of Chinese Patent ApplicationDisclosure No. 201810047850.5 filed on Jan. 18, 2018 in the StateIntellectual Property Office of China, the whole disclosure of which isincorporated herein by reference.

BACKGROUND OF THE DISCLOSURE Field of the Disclosure

Embodiments of the present disclosure relate to the technical field ofdisplay technology, and especially to a display panel, a backlightmodule and a display device.

Description of the Related Art

A Flat Panel Display (abbreviated as FPD) gradually becomes a mainstreamproduct in market, with increasingly more types thereof, such as LiquidCrystal Display (abbreviated as LCD), Organic Light Emitted Diode(abbreviated as OLED), Plasma Display Panel (abbreviated as PDP) andField Emission Display (abbreviated as FED), and the like.

A display panel of relevant art may typically use a color resistant filmlayer, e.g., the LCD display panel may typically be provided with thecolor resistant film layer at a light-emergent side of its backlightmodule so as to convert a light form the backlight module into light ofdifferent color(s). The OLED display panel may also for example beequipped with white OLED devices cooperating with the color resistantfilm layer so as to implement a colored display.

Due to different application scenarios, there may be differentrequirements on colors of the display panel correspondingly; in otherwords, as to different types of display panels, specifications thereofconcerning red, green, blue colors may vary. For this purpose, it isnecessary to develop different photoresist materials each of which maycooperate with a certain backlight so as to obtain, e.g., a bluephotoresist material meeting a requirement on specification of adominant wavelength which is equal to 469 nm.

SUMMARY OF THE DISCLOSURE

The embodiments of the present disclosure have been made to overcome oralleviate at least one aspect of the above mentioned disadvantagesand/or shortcomings in the prior art, by providing a display panel, abacklight module and a display device.

Following technical solutions are adopted in exemplary embodiments ofthe disclosure for achieving the above desired technical purposes.

According to an aspect of the exemplary embodiment of the presentdisclosure, there is provided a display panel, comprising: a firstsubstrate and a second substrate provided opposite to the firstsubstrate, and a plurality of pixels arranged in an array between thefirst substrate and the second substrate, each pixel comprising at leastthree sub-pixels of different colors, wherein a region of the displaypanel corresponding to at least one of the sub-pixels of differentcolors is further provided with a photonic crystal layer, which isconfigured to filter a light ray in a predetermined waveband and toobtain a color of an emergent light from the region of the display panelcorresponding to the at least one of the sub-pixels similar to an objectcolor thereat.

In the display panel provided by an embodiment of the disclosure, eachof the sub-pixels comprises a liquid crystal layer and a photoresistlayer of a corresponding color; and the photonic crystal layer isarranged in one of positional relationships relative to the firstsubstrate, the second substrate and the crystal layer: the photoniccrystal layer is located at a side of the first substrate facing towardsthe liquid crystal layer; the photonic crystal layer is located at aside of the second substrate facing towards the liquid crystal layer;the photonic crystal layer is located at a side of the first substratefacing away from the liquid crystal layer; and the photonic crystallayer is located at a side of the second substrate facing away from theliquid crystal layer.

In the display panel provided by an embodiment of the disclosure, eachof the sub-pixels comprises an organic electroluminescent structure of acorresponding color; and the photonic crystal layer is located at alight-emergent side of the organic electroluminescent structure.

In the display panel provided by an embodiment of the disclosure, eachof the sub-pixels comprises a photoresist layer of a corresponding colorand an organic electroluminescent structure which emits a white light,the photoresist layer being located at a light-emergent side of theorganic electroluminescent structure; and the photonic crystal layer islocated at a light-emergent side of the organic electroluminescentstructure, and one of the photonic crystal layer and the organicelectroluminescent structure is arranged between the photoresist layerand the other of the photonic crystal layer and the organicelectroluminescent structure.

In the display panel provided by an embodiment of the disclosure, eachpixel comprises sub-pixels of three different colors, comprising a redsub-pixel, a green sub-pixel and a blue sub-pixel; and the photoniccrystal layer is at least provided in a region of the display panelcorresponding to the blue sub-pixel.

In the display panel provided by an embodiment of the disclosure, aportion of the photonic crystal layer provided in the regioncorresponding to the blue sub-pixel is configured to filter a light rayin a waveband between 380 nm and 435 nm; a portion of the photoniccrystal layer provided in a region corresponding to the red sub-pixel isconfigured to filter a light ray in a waveband between 415 nm and 435nm; and a portion of the photonic crystal layer provided in a regioncorresponding to the green sub-pixel is configured to filter a light rayin a waveband between 515 nm and 525 nm.

In the display panel provided by an embodiment of the disclosure, thephotonic crystal layer comprises a base film layer and micropores formedand distributed uniformly in the base film layer, the micropores havinga refractive index smaller than that of the base film layer.

In the display panel provided by an embodiment of the disclosure, thebase film layer is formed by a polymeric material formed by athree-dimensional stacking of spherical polymer structures abutting oneanother tightly.

In the display panel provided by an embodiment of the disclosure, thebase film layer is formed by a polymeric material formed by athree-dimensional stacking of one type of polystyrene microspheres,polymethylacrylic acid microspheres, and silicon dioxide microspheres.

According to another aspect of the exemplary embodiment of the presentdisclosure, there is provided a backlight module for a liquid crystaldisplay panel, comprising a backlight source configured to provide alight source for the liquid crystal display panel, the liquid crystalpanel comprising a plurality of pixels each of which comprise at leastthree sub-pixels of different colors, wherein the backlight modulefurther comprises a photonic crystal layer located at a light-emergentside of the backlight source, in a region thereof corresponding to atleast one of the sub-pixels of different colors of the liquid displaypanel, and the photonic crystal layer being configured to filter a lightray in a predetermined waveband and to obtain a color of an emergentlight from the region of the display panel corresponding to the at leastone of the sub-pixels similar to an object color thereat.

In the backlight module provided by an embodiment of the disclosure,each pixel comprises sub-pixels of three different colors, comprising ared sub-pixel, a green sub-pixel and a blue sub-pixel; and the photoniccrystal layer is at least provided in a region of the backlight modulecorresponding to the blue sub-pixel.

In the backlight module provided by an embodiment of the disclosure, aportion of the photonic crystal layer provided in the region of thebacklight module corresponding to the blue sub-pixel is configured tofilter a light ray in a waveband between 380 nm and 435 nm; a portion ofthe photonic crystal layer provided in a region of the backlight modulecorresponding to the red sub-pixel is configured to filter a light rayin a waveband between 415 nm and 435 nm; and a portion of the photoniccrystal layer provided in a region of the backlight module correspondingto the green sub-pixel is configured to filter a light ray in a wavebandbetween 515 nm and 525 nm.

In the backlight module provided by an embodiment of the disclosure, thephotonic crystal layer comprises a base film layer and micropores formedand distributed uniformly in the base film layer, the micropores havinga refractive index smaller than that of the base film layer.

In the backlight module provided by an embodiment of the disclosure, thebase film layer is formed by a polymeric material formed by athree-dimensional stacking of spherical polymer structures abutting oneanother tightly.

In the backlight module provided by an embodiment of the disclosure, thebase film layer is formed by a polymeric material formed by athree-dimensional stacking of one type of polystyrene microspheres,polymethylacrylic acid microspheres, and silicon dioxide microspheres.

According to still another aspect of the exemplary embodiment of thepresent disclosure, there is provided a display device, comprising thedisplay panel as above.

According to yet another aspect of the exemplary embodiment of thepresent disclosure, there is provided a display device, comprising thebacklight module as above.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other features and advantages of the present disclosurewill become more apparent and a more comprehensive understanding of thepresent disclosure can be obtained, by describing in detail exemplaryembodiments thereof with reference to the accompanying drawings, inwhich:

FIG. 1 illustrates a schematic structural cross-sectional view of adisplay panel according to an embodiment of the disclosure;

FIG. 2 illustrates a schematic perspective view of a photonic crystallayer of the display panel according to an embodiment of the disclosure;

FIG. 3 illustrates a schematic top view of a photonic crystal layer ofthe display panel according to an embodiment of the disclosure;

FIG. 4 illustrates a schematic structural cross-sectional view of adisplay panel according to another embodiment of the disclosure;

FIG. 5 illustrates a schematic structural cross-sectional view of adisplay panel according to still another embodiment of the disclosure;

FIG. 6 illustrates a schematic structural cross-sectional view of adisplay panel according to yet another embodiment of the disclosure;

FIG. 7 illustrates a schematic structural cross-sectional view of adisplay panel according to still yet another embodiment of thedisclosure;

FIG. 8 illustrates a schematic structural cross-sectional view of adisplay panel according to a further embodiment of the disclosure;

FIG. 9 illustrates a schematic structural cross-sectional view of adisplay panel according to further another embodiment of the disclosure;and

FIG. 10 illustrates a schematic structural cross-sectional view of abacklight module according to an embodiment of the disclosure.

DETAILED DESCRIPTION OF EMBODIMENTS OF THE DISCLOSURE

A photonic crystal material refers to a material which is provided witha special lattice structure which may respond to incoming light.Specifically, just like a instance in which there are ions appearingperiodically at lattices sites (i.e., at sites where various atoms arelocated) in a semiconductor material, then, in the photonic crystalmaterial, there is a material having a relatively smaller refractiveindex (named as “sites of low refractive index”, e.g., air-filledcavities/voids formed manually) existing periodically at some locationsin another material having a relatively larger refractive index (namedas “sites of high refractive index”); and due to the periodicalstructure created by an alternative arrangement between the sites ofhigh refractive index and the sites of low refractive index therein,photonic band gaps may be formed similar to a forbidden band orforbidden energy gap in a semiconductor material. The photonic crystalmaterial may modulate electromagnetic waves having correspondingwavelength(s); in other words, when an electromagnetic wave propagatesin the lattice structure of the photonic crystal material, it may bemodulated due to the existence of Bragg scattering, then it energy formsan energy band structure in which the band gaps (i.e., photonic bandgaps) emerge between adjacent energy bands, such that photons eachhaving energy within the photonic band gap(s) may fail to enter thephotonic crystal material. And distances among the sites of lowrefractive index arranged periodically within the photonic crystalmaterial are equal to one another, resulting in a band gap effectapplied merely to an optical wave of a certain frequency by the photoniccrystal material having the sites of low refractive index arrangedperiodically at a regular distance (referred to as period distancehereinafter). In other words, only a light wave of a specific frequencymay be prevented completely from propagating in the photonic crystalmaterial having a specific period distance.

In embodiments of the disclosure, by designing and forming in areasonable way the lattice structure of the photonic crystal material,then the energy band structure of the photonic crystal material may bedesigned accordingly. By the photonic crystal material thus formed,light of a certain waveband may be filtered out, so as to furtherimplement a fine adjustment on lights of various colors emitting from adisplay panel of the relevant art, and thus to meet a requirement onvarious specifications of colors of emergent light.

To this end, a display panel, a backlight module and a display deviceare provided in embodiments of the disclosure.

Exemplary embodiments of the present disclosure will be describedhereinafter in detail with reference to the attached drawings, whereinthe like reference numerals refer to the like elements. The presentdisclosure may, however, be embodied in many different forms, and thusthe detailed description of the embodiment of the disclosure in view ofattached drawings should not be construed as being limited to theembodiment set forth herein; rather, these embodiments are provided sothat the present disclosure will be thorough and complete, and willfully convey the general concept of the disclosure to those skilled inthe art.

In the following detailed description, for purposes of explanation,numerous specific details are set forth in order to provide a thoroughunderstanding of the disclosed embodiments. It will be apparent,however, that one or more embodiments may be practiced without thesespecific details. In other instances, well-known structures and devicesare schematically shown in order to simplify the drawing.

Respective dimension and shape of each component in the drawings areonly intended to exemplarily illustrate the contents of the disclosure,rather than to demonstrate the practical dimension or proportion ofcomponents of a display panel, a backlight module and a display device.

According to a general technical concept of embodiments of the presentdisclosure, in a first aspect of the embodiments of the disclosure,there is provided a display panel, as illustrated in FIG. 1, comprising:a first substrate 1 and a second substrate 2 provided opposite to thefirst substrate 1, and a plurality of pixels 3 arranged in an array(e.g., arranged in a matrix) between the first substrate 1 and thesecond substrate 2, each pixel 3 of the plurality of pixels comprisingat least three sub-pixels 30 of different colors. A region of thedisplay panel corresponding to at least one of the sub-pixels ofdifferent colors is further provided with a photonic crystal layer 4(e.g., located on a side of the second substrate 2 facing away from thefirst substrate 1), the photonic crystal layer 4 being configured tofilter a light ray in a predetermined waveband so as to obtain a colorof an emergent light from the region of the display panel correspondingto the at least one of the sub-pixels 30 similar to or even equal to anintended object color thereat.

As to the display panel provided in the embodiment of the disclosure,since the photonic crystal layer is provided in a region of the displaypanel corresponding to at least one of the sub-pixels of differentcolors, and is for example configured to filter a light ray in apredetermined waveband, then, a fine adjustment on colors of emergentlight emitted from the sub-pixels may further be implemented by thephotonic crystal layer, such that a color of an emergent light from theregion of the display panel corresponding to the at least one of thesub-pixels 30 may be similar to an intended object color thereat, so asto meet a requirement on various specification of colors of emergentlight.

Specifically, in the display panel according to an embodiment of thedisclosure, each pixel comprises sub-pixels of three different colors,specifically, comprising a red (R) sub-pixel, a green (G) sub-pixel anda blue (B) sub-pixel.

And it should be noticed that, in all the figures of the embodiments ofthe disclosure, by way of example, it is illustrated that each pixel 3comprises sub-pixels 30 of three different colors, i.e., R, G, Bsub-pixels, and the regions corresponding to R, G, B sub-pixelsrespectively are provided with respective photonic crystal layers 4, forillustration schematically.

Specifically, the display panel provided in embodiments of thedisclosure may be considered to be equivalent to a display panelconstructed on the basis of a colored display panel in the relevant artby adding a photonic crystal layer, which photonic crystal layer islocated on a side of one substrate facing away from an oppositesubstrate and is configured to be used to filter a light ray in apredetermined waveband, so as to implement a fine adjustment on fineadjustment on colors of emergent light emitted from the colored displaypanel in the relevant art. Therefore, by providing the photonic crystallayer to filter a light of a specific waveband, a specific requirementof colors may be met.

Specifically, in the display panel provided in embodiments of thedisclosure, as illustrated in FIG. 2, the photonic crystal layer 4 isformed by a base film pixels 40 and micropores 41 formed and distributeduniformly in the base film layer 40, the micropores 41 having arefractive index smaller than that of the base film layer 40.

Specifically, important structural parameters of the photonic crystallayer comprise aperture size(s) of the micropores, distances among themicropores, depth(s) of the micropores; and by controlling theseparameters, different dielectric constants may be obtained so as tomodulate the electromagnetic waves passing therethrough and thus tofilter light rays of different wavebands.

Specifically, in the display panel provided in embodiments of thedisclosure, the micropores in the base film layer is for example formedby etching; accordingly, a material of the base film layer is forexample a silicon-based (Si-based) semiconductor material or ametal-oxide semiconductor material, or alternatively for example alight-sensitive resin material. Of course, it may also alternatively beany other material etched to have micropore structures.

However, since the micropores in the photonic crystal layer haverelatively small aperture sizes, typically at nano-scale sizes, then,there is a relatively high requirement on the etching process, and it isrelatively difficult to obtain micropores of such sizes by relevantetching technology. Therefore, in the display panel provided inembodiments of the disclosure, as illustrated in FIG. 3, the material ofthe base film pixels 40 is implemented as a polymeric material formed bya three-dimensional stacking of spherical polymer structures abuttingone another tightly, with gaps/voids in the three-dimensional stackingof spherical polymer structures equivalently functioning as themicropores 41 of the base film layer 40.

In specific implementation, the photonic crystal layer is for exampleprepared by one or more of sputtering, quasi-equilibrium evaporation,gravity deposition/sedimentation, spin coating. By controlling diametersof the micropores of each of the spherical polymer structures duringpreparation, then, aperture sizes and depths of the micropores, andspaces/intervals among the micropores, as defined (e.g., in advance) maybe controlled.

By way of example, in the display panel provided in embodiments of thedisclosure, the material of the base film layer is for example apolymeric material formed by a three-dimensional stacking of polystyrenemicrospheres, polymethylacrylic acid microspheres, or silicon dioxidemicrospheres, without being defined or limited herein specifically.

Specifically, in the display panel provided in embodiments of thedisclosure, for example, the photonic crystal layer is provided on alight emergent side so as to ensure that any light may pass through thephotonic crystal layer before outgoing/shooting out from the displaypanel. Then a liquid crystal display panel and an OLED display panel aretaken as examples to illustrate specific positioning of the photoniccrystal layer, as set forth in detail hereinafter.

In a condition that the display panel is the liquid crystal displaypanel, since the liquid crystal display panel is a passivelight-emitting device which may not emit light itself, then a backlightmodule is required to provide a light source for the liquid crystaldisplay panel so as to ensure the liquid crystal display panel maydisplay images. Therefore, in specific implementation, the photoniccrystal layer is for example located at any position of the region(s) ofthe display panel corresponding to the sub-pixel(s).

Specifically, in a condition that the display panel is the liquidcrystal display panel, as illustrated in FIG. 4 to FIG. 7, each of thesub-pixels 30 comprises a liquid crystal layer 301 and a photoresistlayer 302 of a corresponding color. For example, each red sub-pixel 30is provided therein with a red photoresist layer 302, each bluesub-pixel 30 is provided therein with a blue photoresist layer 302, andeach green sub-pixel 30 is provided therein with a green photoresistlayer 302.

By way of example, in the display panel provided in an embodiment of thedisclosure, as illustrated in FIG. 4, the photonic crystal layer 4 islocated at a side of the first substrate 1 facing towards the liquidcrystal layer 301;

By way of example, in the display panel provided in an embodiment of thedisclosure, as illustrated in FIG. 5, the photonic crystal layer 4 islocated at a side of the first substrate 1 facing away from the liquidcrystal layer 301;

By way of example, in the display panel provided in an embodiment of thedisclosure, as illustrated in FIG. 6, the photonic crystal layer 4 islocated at a side of the second substrate 2 facing towards the liquidcrystal layer 301; and

By way of example, in the display panel provided in an embodiment of thedisclosure, as illustrated in FIG. 7, the photonic crystal layer 4 islocated at a side of the second substrate 2 facing away from the liquidcrystal layer 301.

Specifically, in a condition that the display panel provided in anembodiment of the disclosure is the liquid crystal display panel, thefirst substrate is an array substrate and the second substrate is anopposite substrate, then, the photoresist layer may for example belocated at a side of the array substrate, or for example bealternatively or additionally located at a side of the oppositesubstrate, without being defined/limited herein specifically.

Furthermore, in the liquid crystal display panel provided in theembodiment of the disclosure, a light originating from the backlightmodule may firstly pass through the photonic crystal layer and then passthrough the photoresist layer; of course, the light originating from thebacklight module may also for example firstly pass through thephotoresist layer and then pass through the photonic crystal layer,without defining or limiting specific relative positions of the photoniccrystal layer and the photoresist layer.

By way of example, in a condition that the display panel provided in theembodiment of the disclosure is the OLED display panel, as illustratedin FIG. 8, each of the sub-pixels 30 comprises an organicelectroluminescent structure of a corresponding color, i.e., OLED (R),OLED (B) or OLED (G). For example, each red sub-pixel 30 comprises a redorganic electroluminescent structure OLED (R), each blue sub-pixel 30comprises a blue organic electroluminescent structure OLED (B), and eachgreen sub-pixel 30 comprises a green organic electroluminescentstructure OLED (G).

And each of corresponding photonic crystal layers 4 may be located at arespective light-emergent side of a corresponding one of the organicelectroluminescent structure OLED (R), OLED (B) and OLED (G).

Or alternatively, for example, in a condition that the display panelprovided in the embodiment of the disclosure is the OLED display panel(e.g., a white OLED), as illustrated in FIG. 9, then, each of thesub-pixels 30 comprises a photoresist layer 301 of a corresponding colorand an organic electroluminescent structure which emits a white light,which is referred to as OLED (W), and the photoresist layer 301 islocated at a light-emergent side of the organic electroluminescentstructure OLED (W).

A corresponding photonic crystal layer 4 is located at a light-emergentside of the organic electroluminescent structure OLED (W). By way ofexample, the corresponding photonic crystal layer 4 is arranged betweenthe organic electroluminescent structure OLED (W) and the photoresistlayer 301; in an alternative embodiment of the disclosure, the organicelectroluminescent structure OLED (W) is arranged between thecorresponding photonic crystal layer 4 and the photoresist layer 301.

Furthermore, in the OLED display panel provided in the embodiment of thedisclosure, a light originating from the organic electroluminescentstructure may for example firstly pass through the photonic crystallayer and then pass through the photoresist layer; of course, the lightoriginating from the organic electroluminescent structure may forexample alternatively firstly pass through the photoresist layer andthen pass through the photonic crystal layer, without defining orlimiting specific relative positions of the photonic crystal layer andthe photoresist layer.

In specific implementation, the organic electroluminescent structurecomprises an anode layer, a light emitting layer and a cathode layer, asin relevant art, without discussing repeatedly herein any more.

Specifically, since the color of the light emitted by the bluesub-pixels in the display panel in the relevant art may hardly meetspecifications desired by the market, then, in the display panelprovided in the embodiment of the disclosure, the corresponding photoniccrystal layer(s) may be provided in the region(s) of the display panelcorresponding to the blue sub-pixels. Of course, as per practicalrequirements, for example, in regions of the display panel correspondingto sub-pixels of other colors, corresponding photonic crystal layers maybe provided additionally, without being defined or limiting hereinspecifically.

Furthermore, in the display panel provided in the embodiment of thedisclosure, typically, in a condition that corresponding photoniccrystal layers in the regions of the display panel corresponding tosub-pixels of different colors may be required to filter light ofidentical wave band, then, these photonic crystal in the regions of thedisplay panel corresponding to the sub-pixels of different colors may bethe same in structure thereof. In a condition that correspondingphotonic crystal layers in the regions of the display panelcorresponding to sub-pixels of different colors may be required tofilter light of different wave bands, or to filter light of at least notexactly identical wave bands, then, these photonic crystal layers in theregions of the display panel corresponding to sub-pixels of differentcolors may be different or at least not exactly the same.

For example, in the display panel provided in the embodiment of thedisclosure, a portion of the photonic crystal layer provided in theregion of the display panel corresponding to the blue sub-pixel isconfigured to filter a light ray in a waveband between 380 nm and 435nm;

For example, in the display panel provided in the embodiment of thedisclosure, a portion of the photonic crystal layer provided in a regionof the display panel corresponding to the red sub-pixel is configured tofilter a light ray in a waveband between 415 nm and 435 nm; and

For example, in the display panel provided in the embodiment of thedisclosure, a portion of the photonic crystal layer provided in a regionof the display panel corresponding to the green sub-pixel is configuredto filter a light ray in a waveband between 515 nm and 525 nm.

The display panel having sub-pixels of three different colors R, G, Bmay be verified, and in a condition that the photonic crystal layers arenot provided, the display panel emits a red light having a wavelength of624 nm, a green light having a wavelength of 548 nm and a blue lighthaving a wavelength of 468 nm. And in a condition that a photoniccrystal layer having a filtering wave band between 380 nm and 435 nm isprovided in each region corresponding to each B sub-pixel, then thewavelength of the blue light may be changed into 469 nm; and in acondition that a photonic crystal layer having a filtering wave band of450 nm is provided in each region corresponding to each B sub-pixel,then the wavelength of the blue light may be changed into 470 nm; and ina condition that a photonic crystal layer having a filtering wave bandbetween 435 nm and 450 nm is provided in each region corresponding toeach B sub-pixel, then the wavelength of the blue light may be changedinto 475 nm. And in a condition that a photonic crystal layer having afiltering wave band between 380 nm and 435 nm is provided in each regioncorresponding to each G sub-pixel, then the wavelength of the greenlight may be changed into 548 nm; and in a condition that a photoniccrystal layer having a filtering wave band of 520 nm is provided in eachregion corresponding to each G sub-pixel, then the wavelength of thegreen light may be changed into 550 nm. And in a condition that aphotonic crystal layer having a filtering wave band between 380 nm and435 nm is provided in each region corresponding to each R sub-pixel,then the wavelength of the red light may be changed into 623 nm.Specific results of simulations are illustrated in Table 1 as shownbelow:

TABLE 1 Results of Simulations Color x y Y λ (nm) Sat Full wave band R0.667 0.304 29.48% 624 94% G 0.295 0.655 66.85% 548 86% B 0.146 0.0728.54% 468 92% 380-435 nm being R 0.669 0.305 15.29% 623 94% filtered G0.295 0.655 66.89% 548 86% B 0.145 0.076 8.50% 469 92% 450 nm beingfiltered B 0.143 0.085 8.18% 470 90% 535-450 nm being B 0.136 0.1147.90% 475 89% filtered 520 nm being filtered G 0.303 0.649 66.40% 55088%

As may be seen from above, the photonic crystal layers implement a fineadjustment on wavelengths of colors of emergent light emitted from thedisplay panel, and since the photonic crystal layers have differentfiltering wave bands, then, respective wavelengths of colors of theemergent light may be different accordingly. Therefore, in specificimplementation, e.g., by designing the filtering wave bands of thephotonic crystal layers, then colors of emergent light of differentspecifications may be obtained. And the design of the filtering wavebands of the photonic crystal layers may be implemented, by a reasonabledesign and formation of the lattice structure of the photonic crystalmaterial and a corresponding design of the energy band structure of thephotonic crystal material.

Based on the same general technical concept of embodiments of thepresent disclosure, in a second aspect of the embodiments of thedisclosure, there is provided a backlight module for a liquid crystaldisplay panel 300, as illustrated in FIG. 10, comprising: a backlightsource 100 configured to provide a light source for the liquid crystaldisplay panel 300, the liquid crystal panel 300 comprising a pluralityof pixels each of which comprise at least three sub-pixels of differentcolors.

The backlight module further comprises: a photonic crystal layer 200located at a light-emergent side of the backlight source, in a regionthereof corresponding to at least one of the sub-pixels of differentcolors of the liquid display panel 300, and the photonic crystal layer200 being configured to filter a light ray in a predetermined wavebandand to obtain a color of an emergent light from the region of thedisplay panel corresponding to the at least one of the sub-pixelssimilar to an object color thereat

As to the backlight module provided in the embodiment of the disclosure,since the photonic crystal layer may be provided in a region thereofcorresponding to at least one of the sub-pixels of different colors ofthe display panel, and is for example configured to filter a light rayin a predetermined waveband, then, a fine adjustment on colors ofemergent light emitted from the sub-pixels may further be implemented bythe photonic crystal layer, such that a color of an emergent light fromthe region of the liquid crystal display panel corresponding to the atleast one of the sub-pixels 30 may be similar to an intended objectcolor thereat, so as to meet a requirement on various specification ofcolors of emergent light.

For example, in the backlight module provided in the embodiment of thedisclosure, each pixel for example comprises sub-pixels of threedifferent colors, comprising a red sub-pixel, a green sub-pixel and ablue sub-pixel; and the photonic crystal layer is at least provided in aregion of the backlight module corresponding to the blue sub-pixel.

By way of example, in the backlight module provided in the embodiment ofthe disclosure, a portion of the photonic crystal layer provided in theregion of the backlight module corresponding to the blue sub-pixel isconfigured to filter a light ray in a waveband between 380 nm and 435nm;

a portion of the photonic crystal layer provided in a region of thebacklight module corresponding to the red sub-pixel is configured tofilter a light ray in a waveband between 415 nm and 435 nm; and

a portion of the photonic crystal layer provided in a region of thebacklight module corresponding to the green sub-pixel is configured tofilter a light ray in a waveband between 515 nm and 525 nm.

By way of example, in the backlight module provided in the embodiment ofthe disclosure, the photonic crystal layer comprises a base film layerand micropores formed and distributed uniformly in the base film layer,the micropores having a refractive index smaller than that of the basefilm layer.

By way of example, in the backlight module provided in the embodiment ofthe disclosure, the base film layer is implemented as a polymericmaterial formed by a three-dimensional stacking of spherical polymerstructures abutting one another tightly.

By way of example, in the backlight module provided in the embodiment ofthe disclosure, the base film layer is for example formed by a polymericmaterial formed by a three-dimensional stacking of one type ofpolystyrene microspheres, polymethylacrylic acid microspheres, andsilicon dioxide microspheres.

Based on the same general technical concept of embodiments of thepresent disclosure, in another aspect of the embodiments of thedisclosure, there is provided a display device, comprising any onedisplay panel as above; or, there is provided a display device,comprising any one backlight module as above. The display device may forexample be any product or a component having display function, such as:mobile phone, tablet computer, television set, display, laptop computer,digital photo frame, navigator and like. Embodiments of the displaydevice may for example refer to above embodiments of the display panelor backlight module as above, without repeating any more.

The solutions of above embodiments of the disclosure have followingbeneficial technical effects:

A display panel, a backlight module and a display device are providedaccording to embodiments of the disclosure; the display panelcomprising: a first substrate and a second substrate provided oppositeto the first substrate, and a plurality of pixels arranged in an arraybetween the first substrate and the second substrate, each pixelcomprising at least three sub-pixels of different colors; and a regionof the display panel corresponding to at least one of the sub-pixels ofdifferent colors is further provided with a corresponding photoniccrystal layer (e.g., the photonic crystal layer is located on a side ofthe second substrate facing away from the first substrate), which isconfigured to filter a light ray in a predetermined waveband. Then, afine adjustment on colors of emergent light emitted from the sub-pixelsmay further be implemented by the photonic crystal layer, such that acolor of an emergent light from the region corresponding to the at leastone of the sub-pixels may be similar to an intended object colorthereat, so as to meet a requirement on various specification of colorsof emergent light.

It should be appreciated for those skilled in this art that the aboveembodiments are intended to be illustrated, and not restrictive. Forexample, many modifications may be made to the above embodiments bythose skilled in this art, and various features described in differentembodiments may be freely combined with each other without conflictingin configuration or principle.

Although the disclosure is described in view of the attached drawings,the embodiments disclosed in the drawings are only intended toillustrate the preferable embodiment of the present disclosureexemplarily, and should not be deemed as a restriction thereof.

Although several exemplary embodiments of the general concept of thepresent disclosure have been shown and described, it would beappreciated by those skilled in the art that various changes ormodifications may be made in these embodiments without departing fromthe principles and spirit of the disclosure and lie within the scope ofpresent application, which scope is defined in the claims and theirequivalents.

As used herein, an element recited in the singular and proceeded withthe word “a” or “an” should be understood as not excluding plural ofsaid elements or steps, unless such exclusion is explicitly stated.Furthermore, references to “one embodiment” of the present disclosureare not intended to be interpreted as excluding the existence ofadditional embodiments that also incorporate the recited features.Moreover, unless explicitly stated to the contrary, embodiments“comprising” or “having” an element or a plurality of elements having aparticular property may include additional such elements not having thatproperty.

What is claimed is:
 1. A display panel, comprising: a first substrateand a second substrate provided opposite to the first substrate, and aplurality of pixels arranged in an array between the first substrate andthe second substrate, each pixel comprising at least three sub-pixels ofdifferent colors, wherein a region of the display panel corresponding toat least one of the sub-pixels of different colors is further providedwith a photonic crystal layer, which is configured to filter a light rayin a predetermined waveband and to obtain a color of an emergent lightfrom the region of the display panel corresponding to the at least oneof the sub-pixels similar to an object color thereat; wherein thephotonic crystal layer comprises a base film layer and micropores formedand distributed uniformly in the base film layer, the micropores havinga refractive index smaller than that of the base film layer, and thebase film layer is formed by a polymeric material formed by athree-dimensional stacking of spherical polymer structures abutting oneanother tightly.
 2. The display panel according to claim 1, wherein eachof the sub-pixels comprises a liquid crystal layer and a photoresistlayer of a corresponding color; and wherein the photonic crystal layeris arranged in one of positional relationships relative to the firstsubstrate, the second substrate and the crystal layer: the photoniccrystal layer is located at a side of the first substrate facing towardsthe liquid crystal layer; the photonic crystal layer is located at aside of the second substrate facing towards the liquid crystal layer;the photonic crystal layer is located at a side of the first substratefacing away from the liquid crystal layer; and the photonic crystallayer is located at a side of the second substrate facing away from theliquid crystal layer.
 3. The display panel according to claim 1, whereineach of the sub-pixels comprises an organic electroluminescent structureof a corresponding color; and wherein the photonic crystal layer islocated at a light-emergent side of the organic electroluminescentstructure.
 4. The display panel according to claim 1, wherein each ofthe sub-pixels comprises a photoresist layer of a corresponding colorand an organic electroluminescent structure which emits a white light,the photoresist layer being located at a light-emergent side of theorganic electroluminescent structure; and wherein the photonic crystallayer is located at a light-emergent side of the organicelectroluminescent structure, and one of the photonic crystal layer andthe organic electroluminescent structure is arranged between thephotoresist layer and the other of the photonic crystal layer and theorganic electroluminescent structure.
 5. The display panel according toclaim 1, wherein each pixel comprises sub-pixels of three differentcolors, comprising a red sub-pixel, a green sub-pixel and a bluesub-pixel; and wherein the photonic crystal layer is at least providedin a region of the display panel corresponding to the blue sub-pixel. 6.The display panel according to claim 5, wherein a portion of thephotonic crystal layer provided in the region corresponding to the bluesub-pixel is configured to filter a light ray in a waveband between 380nm and 435 nm; a portion of the photonic crystal layer provided in aregion corresponding to the red sub-pixel is configured to filter alight ray in a waveband between 415 nm and 435 nm; and a portion of thephotonic crystal layer provided in a region corresponding to the greensub-pixel is configured to filter a light ray in a waveband between 515nm and 525 nm.
 7. The display panel according to claim 1, wherein thebase film layer is formed by a polymeric material formed by athree-dimensional stacking of one type of polystyrene microspheres,polymethylacrylic acid microspheres, and silicon dioxide microspheres.8. A display device, comprising the display panel according to claim 1.9. A backlight module for a liquid crystal display panel, comprising abacklight source configured to provide a light source for the liquidcrystal display panel, the liquid crystal panel comprising a pluralityof pixels each of which comprise at least three sub-pixels of differentcolors, wherein the backlight module further comprises a photoniccrystal layer located at a light-emergent side of the backlight source,in a region thereof corresponding to at least one of the sub-pixels ofdifferent colors of the liquid display panel, and the photonic crystallayer being configured to filter a light ray in a predetermined wavebandand to obtain a color of an emergent light from the region of thedisplay panel corresponding to the at least one of the sub-pixelssimilar to an object color thereat; wherein the photonic crystal layercomprises a base film layer and micropores formed and distributeduniformly in the base film layer, the micropores having a refractiveindex smaller than that of the base film layer, and the base film layeris formed by a polymeric material formed by a three-dimensional stackingof spherical polymer structures abutting one another tightly.
 10. Thebacklight module according to claim 9, wherein each pixel comprisessub-pixels of three different colors, comprising a red sub-pixel, agreen sub-pixel and a blue sub-pixel; and wherein the photonic crystallayer is at least provided in a region of the backlight modulecorresponding to the blue sub-pixel.
 11. The backlight module accordingto claim 10, wherein a portion of the photonic crystal layer provided inthe region of the backlight module corresponding to the blue sub-pixelis configured to filter a light ray in a waveband between 380 nm and 435nm; a portion of the photonic crystal layer provided in a region of thebacklight module corresponding to the red sub-pixel is configured tofilter a light ray in a waveband between 415 nm and 435 nm; and aportion of the photonic crystal layer provided in a region of thebacklight module corresponding to the green sub-pixel is configured tofilter a light ray in a waveband between 515 nm and 525 nm.
 12. Thebacklight module according to claim 7, wherein the photonic crystallayer comprises a base film layer and micropores formed and distributeduniformly in the base film layer, the micropores having a refractiveindex smaller than that of the base film layer.
 13. The backlight moduleaccording to claim 12, wherein the base film layer is formed by apolymeric material formed by a three-dimensional stacking of sphericalpolymer structures abutting one another tightly.
 14. The backlightmodule according to claim 13, wherein the base film layer is formed by apolymeric material formed by a three-dimensional stacking of one type ofpolystyrene microspheres, polymethylacrylic acid microspheres, andsilicon dioxide microspheres.
 15. A display device, comprising thebacklight module according to claim 9.